Don't display Parker specific fields on exhibits that are not Parker

[hudajkhan]

Based on the investigation issue, here are the five fields that only show up in Parker exhibits in Solr: https://github.com/sul-dlss/exhibits/issues/2602 "The fields that only showed up in the Parker exhibit were: book_title_ssim, editor_ssim, university_ssim, range_labels_ssim, and related_document_id_ssim."

[corylown]

Closed by #2643